is 2 55406573 - 1
has 16679041 decimal digits
takes 117.431 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27217.260363.8889 %----17.260363.8889 %
Target27334.523864.3836 %3600006000000011.09223.9337 %45.616065.7846 %
Difference-1-17.2635-0.4947 %-360000-60000000-11.0922-3.9337 %-28.3557-1.8957 %

Known prime factors (1 factor, 78.2 bits, 0.00014120% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
554065733554120159824835950606492478.2343207309139860388
22 × 43 × 109 × 331 × 9901 × 52201
2012-06-019901522011,699.90.03750.0619

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-06-01ChuckChuck-HP2478.2341.6750.000%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-15ANONYMOUSv4_computers212532.17000e-5
2000-03-01ANONYMOUSv4_computers212544.33000e-5
2000-05-31ANONYMOUSv4_computers212560.000
2001-09-22ANONYMOUSv4_computers212570.000
2002-07-20ANONYMOUSv4_computers212580.001
2009-01-011997rj7compw2632640.035
2009-01-03Sturle Sundedanzi.ifi2642660.202
2009-01-05Sturle Sundewright.ifi2662670.270
2009-07-14trifbrownie2672680.539
2011-04-08Åke TilanderPC51-115-012682691.079
2022-06-09LordJuliusManual testing21270
2011-05-26Paul LeylandManual testing2692702.158
2012-03-26GregManual testing27027212.95


ECM factoring results:
No ECM results for M55406573


Lucas-Lehmer results:
No L-L results for M55406573


PRP results:
No PRP results for M55406573


CERT results:
No CERT results for M55406573


P-1 factor-bounds graph:
102
103
104
102
103
104
105
TF factor-bounds graph:
272
270
269
268
267
266
264
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00